Dinosaur extinction due to space dust?
June 14, 2009 12:40 PM Subscribe
Could large land animals have died out due to the Earth's gravity increasing over millions of years?
posted by OneCrayon to Science & Nature (10 answers total) 3 users marked this as a favorite
Every year around 40,000 tons of mass are added to the earth by way of space dust. Perhaps when the massive dinosaurs walked the earth the earths gravity was in "golden window" that would allow such creatures to exist. Over the hundreds of millions of years they existed, could it be possible that the accumulation of dust and the increased gravity that mass brought with it have grown to the point where such giant beasts simply could no longer grow to the sizes they had in the past?
Or, is 40,000 tons of mass, even if it may have been higher in the early solar system, still insufficient to appreciably raise the mass of the earth to a noticeably higher gravity level?
This is something I've wondered about for years but never read anything that may have posed this question.